Laserfiche WebLink
Figure 6. Shift in use of water sources over decades, Twin Cities metropolitan area, 1941-2010. <br />350 <br />■ Groundwater ( Million Gallons/Day ) <br />30O <br />• Surface Water (Million Gallons/Day) <br />250 <br />Total (Million Gallons/Day) <br />200 <br />150 <br />10�� <br />Jo <br />50 - <br />'Ili 1 ,I11111 <br />Ln 1..10 f' r is i ▪ t C I ..i <br />-1 ,i r-1 LD r -I 1.0 CO 1 L' 1 1.0 <br />C C C`) C C'i CTh C C CM C 0 <br />Like private domestic wells, groundwater is a preferred source for public supply across most of the <br />region, due to widespread availability and relatively good water quality and low treatment costs. <br />However, in some locations, higher pumping rates raise the risk of impacting neighboring wells and <br />groundwater -supported surface water features. <br />Over the course of a year, most water is used indoors for household purposes and by commerce and <br />industry (Figure 7). During summer months, however, a significant amount of water is used outdoors, <br />mostly used outdoors for seasonal businesses and lawn irrigation. <br />In the summer, Minneapolis Water Works is the region's largest public water supplier, because the <br />City of Bloomington meets summer peak demand using water purchased from Minneapolis. In the <br />winter, however, Saint Paul Regional Water Services is the region's largest public water supplier. <br />Figure 6 illustrates average yearly indoor (red) and outdoor (green) water use per person in the metro <br />area. Over time, the amount of water used per person for indoor purposes has gone down. More <br />efficient indoor appliances as well as economic conditions may be contributing to this trend. Outdoor <br />water use, however, does not seem to show the same trend. Growth patterns, weather, economic <br />conditions, and technological changes are factors that can affect outdoor water use but in ways that <br />are difficult to predict. <br />WATER SUPPLY MASTER <br />PLAN- Draft June 2015 <br />